非圧縮性流体の中心差分法によるCFDプログラムの開発とその検証

(乱流解析への応用)

抄録

CFD was used to investigate turbulent flow in circular pipes and square pipes. It was found that roughness in the calculation boundary generated disturbances and increased the pressure drop. A period of time during which disturbance was applied and a period of time during which the flow was left without disturbance were set alternately, and the pipe friction coefficient was calculated in the latter time period. Using the mesh length-to-diameter ratio and the Reynolds number as parameters, the values of the pipe friction coefficients calculated were compared with the values of the Moody diagram. Without using any knowledge obtained from experiments, it was possible to get a pipe friction coefficient that was consistent with the Moody diagram.